arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0803.0999q-bio.PE
收藏

网络上传染病规模和概率的界

Bounding the Size and Probability of Epidemics on Networks

Joel C. Miller

摘要:

我们考虑一种传染病沿着网络的边缘传播,该网络可能具有显著的聚类。群体中的个体具有异质性传染性和/或易感性。我们定义一个节点的外传播率是它会感染一个随机选择的邻居给定其传染性和易感性的分布的边缘概率。对于一个给定的外传播率分布,我们找到的条件,给出了上[或下]界的大小和概率的流行病,在弱假设的传输特性,但非常一般的假设网络。我们发现类似的边界为一个给定的分布的非传染性(边缘概率被感染的邻居)。我们还找到了条件,使全球上界的大小和概率。导致这些界限的分布是网络独立的。在高围长网络(局部树型)的特殊情况下,我们能够证明更强的结果。一般来说,当种群是同质的时,流行病的概率和规模最大,当内传播率或外传播率的方差最大时,流行病的概率和规模最小。

英文摘要:

We consider an infectious disease spreading along the edges of a network which may have significant clustering. The individuals in the population have heterogeneous infectiousness and/or susceptibility. We define the out-transmissibility of a node to be the marginal probability that it would infect a randomly chosen neighbor given its infectiousness and the distribution of susceptibility. For a given distribution of out-transmissibility, we find the conditions which give the upper [or lower] bounds on size and probability of an epidemic, under weak assumptions on the transmission properties, but very general assumptions on the network. We find similar bounds for a given distribution of in-transmissibility (the marginal probability of being infected by a neighbor). We also find conditions giving global upper bounds on size and probability. The distributions leading to these bounds are network-independent. In the special case of networks with high girth (locally tree-like), we are able to prove stronger results. In general the probability and size of epidemics are maximal when the population is homogeneous and minimal when the variance of in- or out-transmissibility is maximal.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑